Industry: 3612—Power, Distribution, and Specialty Transformers
Establishments primarily engaged in manufacturing power, distribution, instrument, and specialty transformers. Establishments primarily engaged in manufacturing radio frequency or voice frequency electronic transformers, coils, or chokes are classified in Industry 3677, and those manufacturing resistance welder transformers are classified in Industry 3548.

Airport lighting transformersLine voltage regulators
Auto-transformers for switchboards, except telephone switchboardsLuminous tube transformers
Auto-transformers, electric (power transformers)Machine tool transformers
Ballasts for lighting fixturesRatio transformers
Control transformersRectifier transformers
Current limiting reactors, electricalSignaling transformers electric
Distribution transformers electricSpecialty transformers
Doorbell transformers, electricStreet lighting transformers
Electric furnace transformersToy transformers
Feeder voltage regulators and boosters (electric transformers)Transformers, electric power
Fluorescent ballasts (transformers)Transformers, for electronic meters
Generator voltage regulators electric induction and step typeTransformers, reactor
Ignition transformersTripping transformers
Instrument transformers except portableVibrators interrupter
Isolation transformersVoltage regulating transformers electric power
Lighting transformers, fluorescentVoltage regulators, transmission and distribution
Lighting transformers, street and airport
Codes Titles Number of US Businesses
3612Power, Distribution and Specialty Transformers741
361200Power, distribution and specialty transformers319
36120000Power, distribution and specialty transformers319
361201Power and distribution transformers289
36120100Power and distribution transformers61
36120101Autotransformers, electric (power transformers)15
36120102Control transformers9
36120103Current limiting reactors, electrical11
36120104Distribution transformers, electric36
36120105Feeder voltage boosters (electric transformers)4
36120106Feeder voltage regulators (electric transformers)1
36120107Generator voltage regulators13
36120108Line voltage regulators14
36120109Power transformers, electric72
36120110Transmission and distribution voltage regulators12
36120111Voltage regulating transformers, electric power26
36120112Voltage regulators, transmission and distribution15
361202Lamp ballasts21
36120200Lamp ballasts0
36120201Ballasts for lighting fixtures15
36120202Fluorescent ballasts6
361203Specialty transformers99
36120300Specialty transformers38
36120301Airport lighting transformers2
36120302Autotransformers for switchboards (exc. tele. switchboards)1
36120303Doorbell transformers, electric6
36120304Electric furnace transformers2
36120305Electronic meter transformers14
36120306Fluorescent lighting transformers6
36120307Ignition transformers, for use on domestic fuel burners3
36120308Lighting transformers, fluorescent8
36120309Lighting transformers, street and airport1
36120310Luminous tube transformers0
36120311Machine tool transformers5
36120313Reactor transformers1
36120314Rectifier transformers3
36120315Signaling transformers, electric4
36120316Toy transformers4
36120317Tripping transformers1
361299Power, distribution and specialty transformers, nec13
36129901Instrument transformers (except portable)6
36129902Saturable reactors1
36129903Vibrators, interrupter6